<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            list-style: none;
            box-sizing: border-box;
        }

        :root {
            --initial-width: 600px;
        }

        body {
            width: 100%;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: #3d3d3d;
        }

        .container {
            position: relative;
            width: var(--initial-width);
            height: var(--initial-width);
            border-radius: 50%;
            overflow: hidden;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .containeritem {
            position: absolute;
            width: calc(var(--initial-width) / 10);
            height: calc(var(--initial-width) / 10);
            border: 1px solid #bb3f36;
            border-radius: 50%;
            transform: scale(0);
            box-shadow: inset 0 0 3px 0.5px #bb3f36;
            animation: item-animation 4s infinite;
            animation-delay: var(--t);
        }


        .center {
            position: absolute;
            width: 20px;
            height: 20px;
            border: 1px solid #bb3f36;
            border-radius: 50%;
            box-shadow: inset 0 0 3px 0.5px #bb3f36;
        }


        @keyframes item-animation {
            0% {
                transform: scale(0);
                opacity: 1;
            }

            100% {
                transform: scale(10);
                opacity: 0;
            }
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="center"></div>
        <div class="containeritem" style="--t:1s"></div>
        <div class="containeritem" style="--t:2s"></div>
        <div class="containeritem" style="--t:3s"></div>
        <div class="containeritem" style="--t:1.5s"></div>
        <div class="containeritem" style="--t:2s"></div>
    </div>

</body>

</html>